Lockstitch sewing machine



June 8, 1954 Filed June 29, 1951 WITNESS D. A. GRAESSER 2,680,417

LOCKSTITCH SEWING MACHINE 4 Sheets-Sheet 1 NVENTOR. w 1

ATTORNEY June 8, 1954 D. A. GRAESSER 2,680,417

LOCKSTITCH SEWING MACHINE Filed June 29, 1951 4'Sheets-Sheet 2 v Y X INVENTOR. @avz'd algraesser WI TNESS y ATTORNEY June 1954 D. GRAESSER 2,680,417

LOCKSTITCH SEWING MACHINE Filed June 29, 1951 4 Sheets-Sheet 3 E I E N INVENTOR.

-5- Q 5 I $avz'dQ. 9masse1 I BY ATTORNEY June 8, 1954 ssE 2,680,417

LOCKSTITCH SEWING MACHINE Filed June 29 1951 4 Sheets-Sheet 4 IN V EN TOR.

@avzHQ 9vaesser BY ATTORNEY Patented June 8, 1954 2,680,417 moonsrrron SEWING MACHINE David A. Graesser, Westfield, N.-J., assignor' to The Singer Manufacturing Company, Elizabeth, N. J., a corporation of New Jersey 1 Application June 29, 1951, Serial No. 234,232

12 Claims.

.This invention relates to lock-stitch sewing machines and it has a primary object to improve the sewingqualities of such machines, especially when operating at high. speeds.

:A more specific. object of this invention. is to provide a lock-stitch sewing machine in which the stitching .instru-mentalities are arranged so as to produce a more favorable lead of the bobbinthrea'd; relative to the Work-support needle-receiving aperture, thereby to reduce the snubbing action of the thread-about the rear. wall of the needle-receiving aperture.

A further object of this invention is to produce a-lock-stitch sewing machine which is capable ofsewing. at high'speeds with a light needlethread tension.

Astill further object of this invention is to provide -a lock-stitch sewing, machine havingxa' rotary loop-taker which is designed to. cooperate withaareciprocatoryneedle in .a manner such ture'd work-supportof a sewing machine.

uln accordance with a preferred embodiment of the present invention, the axisof :the loop-taker is arranged forwardly of the-.work-support needle aperture "whilethe path. of needle reciprocation isidisposed at'rightiangles .tolthe top surface of the-:work-support so that when extended, the path? of needle reciprocation is disposed in laterally spaced relation with the axis of the looptaker.

.Preferably, :the bobbin-case carrier, which has itszperipheral rib. journaled in the hook raceway, has been turned counterclockwise, as viewed from the face of the hook, so thatthe rib gap will b'e:;positipned relative to the needle in a manner designed tofacilitate'the positioning of the needle loop about .the bobbin-case carrier as well as to facilitatethe release of such loop from the bobbin-case carrier.

With-the above and other objects in view, as willhereinafter appear, the invention comprises the devices, combinations and arrangements of parts hereinafter set forth and illustrated in the accompanying. drawings of a preferred embodiment of the invention, from which the several .featuresof the invention and the advantages attained thereby will be readily understood by those skilled'in the art.

- In. the drawings-- .'-Fig. 1 'representsa' longitudinal sectional view of a lock-stitch sewing machine embodying the present invention.

Fig. 2 represents a left end view of the machine illustrated in Fig. 1 with the face-plate removed.

Fig. 3 represents a vertical sectional view taken substantially-along the line 33 of Fig. 1.

Fig. 4 represents a, bottom plan view of the machine illustrated in Fig. 1.

Fig. 5- represents, on an enlarged scale, a top plan view of 'a pair of: hypoid gears which are employed in the present machine, and which view is taken substantially along the line'55 of Fig. 1.

Fig. 6 represents a side elevation view of the gears disclosed in Fig. 5.

Fig. 7 is a-diagrammatic view'illustrating the improved arrangement of the elements of the stitch-forming mechanismduring the loop-seizing portion of the stitch-forming cycle.

Fig; 8 represents a plan View of the rotary hook of the present machine showing it associatedwith its rotation-restrainingmeans and the reciprocatory needle during the loop-seizing portion of its cycle.

\ Fig. 9 represents a view-similar to Fig. '7 but illustrating. the stitch-forming elements at that portion of the cycle when the needle loop is initially expanded about the bobbin-case. carrier.

Fig. 10 represents an inner face view ofthe bobbin-case carrier, with the rotary hook body in section, showing a seized and partially expanded needle-loop just prior to the casting of the inner or take-up limb of the needle-loop off from the outer peripheral'wall of the bobbincase carrier and over. the inner peripheral edge of the bobbin-case carrier onto the inner face of the latter.

Fig. 11 represents. a view similar to Fig. 7 but illustrating the stitching instrumentalities at that point in the cycle just prior to the so-called cast-off of the needle-loop from the beak of the loop-taker hook.

Fig. 12 is a top plan view of the loop-taker showing the bearing rib escape gap open. and the needle-loop escaping therefrom.

Referring more specifically to the drawings, he invention is illustrated as embodied in a sewing'machine comprising a base 15,. affording a horizontally disposed work-supporting. plate 4 6, having a front edge I! proximate to the operator,

and arear edge l8 remote therefrom. Preferably, a portion I9 oi the'work-support is removably secured to the-main portion thereof and it is provided with a needle-hole 2B and slots 2| for thepassagepf .a.conventionalfeedsdog 22, later to be referred to. The portion I5 is commonly known as a throat-plate of the machine but for the purpose of this disclosure may be considered broadly as part of the worksupport.

Rising from the right end of the work-support I6 is a hollow standard 23 having formed integrally therewith an overhanging bracket-arm 24 carrying at its free end a hollow bracketarm head 25 which is normally closed by a removable face-plate Z5. Journaled lengthwise of the arm 24 in bearings 21, 28 and 29 is a main or needle-bar driving shaft 38 carrying, at its rear end, a combined belt pulley and hand wheel 3! which may be driven from any suitable source of power.

Journaled in the base i5, beneath the worksupporting plate 16, is rotary loop-taker driving shaft 32 which carries, at its forward end, a looptaker of the rotary-hook lock-stitch type, desi nated generally as 33. The loop-taker comprises the usual cup-shaped rotary hook body 3 3 with a cylindrical bobbin-case carrier 35 journaled therein but held against rotation with the hook body by means of a rotation-restraining notch 36 entered by a tongue 31 of a rotation-restraining bar 38 mounted on the under side of the work-support I6.

The'loop-taker driving shaft 32 is journaled in bearings 39 and Ml carried by the base 65 and is driven from the main shaft 39, at a ratio of 2 to 1 through the medium of a pair of bevel gears M, 42, a shaft 33 journaled lengthwise within the standard 23, and a pair of hypoid gears it, 45. Thus, the loop-taker is given two rotations for each rotation of the main shaft 3%. Referring particularly to Figs. 1 and 3, the shaft 43 is journaled in upper and lower bearings Q6 and 47 carried by the inner portion of the frame 23. The axis of the shaft 43, in a preferred embodiment of the present invention, is vertically disposed and forms with the axis of the shaft 30 a vertically disposed plane which is horizontally spaced from the axis of the shaft 32 as is best disclosed in Fig. 3. placement is represented in Figs. 3 and 5 by the letter at, and in a preferred embodiment of the invention the letter .1: represents substantially .160 inch.

At its forward end, the shaft 3!) has secured to it a crank-disk 48 carrying a crank-pin 59, which, through a link 50 and a collar 5! transmit reciprocatory motions to a vertically disposed needlebar 52 slidingly mounted in bearings 53 and 54 in the head 25. At its lower end, the needlebar carries an eye-pointed needle 55 which, in the formation of stitches, cooperates with the loop-taker 33, before mentioned. E'he crank-pin 49 also a-ctuates a link type needle-thread takeup device designated generally as 55, which cooperates with a manually regulatable needlethread tension 5's in controlling the needle-thread and in tightening and setting the stitch. Also mounted in the head 25, substantially parallel to the vertically disposed needle-bar 52, is a spring pressed presser-bar 58 which carries, at its lower end, a presser-foot 59.

The work is advanced past the stitch-forming mechanism by a four-motioned work-feeding mechanism including a feed-drive rock-shaft 60, and a feed lift rock-shaft 6! each journaled in bearings depending from the work-plate 6. The feed-drive rock-shaft has an upstanding arm 62 of which the upper end is pivotally connected at 63 to the rear end of a feed-bar 54 carrying This horizontal disthe aforementioned feed-dog 22. At its forward end, the feed-bar carries a stud 65 upon which is journaled a block 66 slidingly fitted within the forked free end of an arm 61 secured upon the feed-lift rock-shaft 61.

Secured to the under side of the base !5 is a casing 88 of an oil pump which draws oil from the reservoir, formed in a pan on which the machine is normally supported, and forces the oil through suitable conduits to the various bearings throughout the machine. This pump is actuated by the vertically arranged shaft 43, all in a conventional fashion.

The feed-drive rock-shaft 68 and the feed-lift rock-shaft 6| are actuated from eccentrics 69 and 10 carried by the main shaft 30 through the medium of pitmans 7i and 12 connected to rockarms '13 and it carried, respectively, by the shafts SH and 6!.

As hereinbefore stated, this invention has as an object to improve the sewing qualities of high speed lock-stitch sewing machines. This has been attained by a novel construction and arrangement of parts now to be described. Referring particularly to Figs. 2 and 7 it will be seen that, in accordance with the present invention, the shaft 32, and, therefore, the horizontal axis of rotation of the loop-taker 33, is arranged in a vertical plane a, a substantially to one side of and parallel to a plane I), b, which latter plane is normal to the work-supporting surface of the machine and passes through the needleaperture 20 in the throat-plate l9 and through the vertical path of needle reciprocation. This places the thread-guiding aperture 1'5, as well as the thread guiding groove 16 slightly to the rear of the rear wall ll of the needle hole 28. As is conventional in rotary loop-takers, the

bobbin-thread 18 is carried within a bobbin-case 79, and emerges through the bobbin-case aperture 75. With this present arrangement, the bobbimthread extends more nearly vertical from the aperture '15 to the needle-hole 2!) than it does in conventional lock-stitch machines. Therefore, during the feed of the work the bobbin-thread is not snubbed about the wall 1'! to the extent or with the pressure that it is snubbed in conventional type machines. Because of this reduced snubbin action, and reduced pressure of the bobbin thread on the wall 11', the feeding of the work is facilitated, thereby producing more uniform sewing and enabling the needle-thread loop to be more readily pulled up between the bobbin thread and the wall Tl during the tightening of the stitch. Likewise, this reduction in pressure between the bobbin thread 18 and the wall 11 greatly reduces the sawing action between the needle and bobbin threads.

The present invention also contemplates, as hereinabove noted, the provision of a novel arrangement between the loop-taker and a reciprocatory needle wherein the latter reciprocates in a vertical direction so that the extended path of needle reciprocation lies in a plane I), b which is horizontally spaced from the loop-taker axis and which is parallel to a vertical plane passing through such axis. As hereinabove noted, in a preferred form of the present invention, this horizontal spacing amounts substantially to .160 inch.

The present invention also contemplates the provision in a lock-stitch sewing machine of a rotary loop-taker type, having a bobbin-case carrier 35, and which is now turned in a counterclockwise direction, as viewed from the face of the rotary loop taker, a sufiicient d-istanceso that its bearing rib gap will be positioned relative to the'reciprocatory needle 55 ina'manner calculated to facilitate the formation of stitches during highspeed operation of the sewing machine. The present loop-taker comprises a cupshaped bOdy'SA -haVing a loop-seizing beak 8Q, aloop-controlling tail 8| and a circular raceway 82 in which is journaled a peripheral bearing rib'83 of the stationary-bobbin-case carrier element55. The hook body 34 is carried as usual by the hook-shaft 32.

rib 83 of the bobbin-case carrier element has Theperipheral bearing a gap in its upper portion to provide a loopdetaining shoulder-8t and a radial loop-confintween the shoulder 85 and the plane a, a which distance represents the amount of advancement of the present bobbin-case carrier about its axis in a counterclockwise direction relative to the conventional type rotary hook which is illustrated in the U. S. patentof Kessler No. 2,685,699, June 29, 1937. In a preferred form of the present invention this angle Y is substantially Still I referring to Fig. 10, the angle S between the shoulders 84 and 85, in a preferred form of. the present invention, is approximately equal to 43.

The bobbin-case carrier 35 is formed at its needle-loop cast-off side with a conventional needle-loop controlling flange St in the upper portion of the front face of which is formed the above noted rotation-restraining notch 38 loosely entered by the tongue 31 of the rotation-restraining bar 38 mounted on the under side of the bed i 5. The tail iii of the rotary hook member 3a has a needle-loop supporting surface-87 which is disposed at a distance from .the axis of the hook member greater than the maximum radial dimension of the peripheral bearing rib 83 ofthe bobbin case and overhangs such bearing rib. This surface holds the needle loop off of the bearing rib 83 and cooperates with the flange 86 to control the needle-loop in a conventional manner.

Removably fitted in the bobbin-case carrier element 35 is the companion bobbin-case it which carries thebobbin or under thread. For a more complete description of this bobbin-case reference may be had to the above noted Kessler patent. i

As'may be particularly observed from Figs. 10 and 12, the cylindrically shaped bobbin-case carrier 35 has a cylindrical wall 83 which supports the bearing rib 83 and about which wall the take- .up' limb of the needle thread is drawn as the needleloop is expanded about the bobbin-case carrier.

The operation or". the machine is, as follows: The loop-taker beak 8i,.as shown in Figs. Tand 8, seizes the loop of threadfrom the needle as the loop-taker beak moves in a counterclockwise direction and away from its highest point of travel. Continued rotation of the hook expands such loop and casts it about the bobbin-case carrier in a manner as is. illustrated. in Figs. 9

bobbin-case carrier'while the take-up limb passes behind the latter element. As soon as the looptaker reaches its cast-offzposition, which isillustrated inFig. 11,the crank-operated take-up 56 begins its quick upstroke and draws the needleloop 01f of the beak and onto the loop-controlling tail M as shown in Fig. 12. As the action continues from the position shown in Fig. 9, the take-up draws the-work-limb of the loop-into the notch Iit as shown in Fig. 11. Shortly thereafter the'needle-loop escapes from the n0tch-36 asthe" loop is withdrawn from the hook-beak 8t, and then theneedle loop is caught about the tail ti. Finally, the loop is dropped by the tail 8i and is drawn up to the work by the take-up to complete the stitch. The point at which the loop escapes on of the tail BI is not only dependent upon the position of the tail-8i relative to the reciprocatory needle 55, but it is also dependent upon the position of the shoulder 35" relative to the needle 55. By positioning the shoulder substantially 15, measured-along an are generated about the axis of rotary hook rota- 'tion, past the plane'a, a and in acounterclockwise direction as viewed in Fig. 7, it has been found that most favorable results will be obtained. 'Also, the point at which the needle loop is first expanded about the bobbincase carrier in a manner illustrated in Fig.9 is determined by the position of the shoulder 84 relative to the needle 55. In a preferred form of the present invention, the shoulder 84 is located substantially 58 away from the plane a, a measured along an are generated about the axis of hook rotation.

The above described novel arrangement between a rotary loop-taker and its cooperating reciprocatory needle hasimproved the action of a conventional lock-stitch sewing machine toa marked degree, thereby enabling the machine to operate at high speeds without breaking the needle thread and at the same time permitting the machine to operate at such high speeds with a very light needle-thread tension.

Having thus set forth the nature of the invention, what I claim herein is:

1. A sewing machine comprising, an endwise reciprocatory needle confined for rectilinear movements, a rotary loop-taker complemental to said needle in the formation of lock-stitchesand having a loop-seizing beak, said loop-taker being mounted for rotation-about an. axis disposed. in

"laterally spaced relation with the lengthwise ex- .loop-taker,.and means for actuating said needle and said loopetaker in timed relation, with said .loop takerbeing rotated in a direction such that its loopF-seizingbeak movesduring its loop-seizing portion of its cycle through aplane containing said needle path and away from a plane containing-saidloop-taker axis; which two latter planes are dispose-din parallelism witheach other.

2. .Av sewing machine'comprising, an endwise reciprocatory needle confined for rectilinear movements, a rotary loop-taker complem ntal to said needle in the formation of lock-stitches and .havingaloop-seizingbeak and a raceway, said loop-taker being mounted for rotation aboutan axis disposed .in. laterally-spaced relation with the lengthwise.extendedpath of needle-reciprocation and being disposed at right angles to a plane containing such path, said lateral spacing being less than the radius of said loop-taker, a substantially cylindrical stationary bobbin-case carrier having a peripheral bearing rib journaled in said raceway, and means for actuating said needle and said loop-taker in timed relation with each other, said loop-taker being rotated in a direction such that its loop-seizing beak moves during its loop-seizing portion of its cycle through a plane containing said needle path and away from a plane containing said loop-taker axis, which two latter planes are disposed in parallelism with each other.

3. A sewing machine comprising, an endwise reciprocatory needle confined for rectilinear movements in a vertical direction, a rotary looptaker complemental to said needle in the formation of lock-stitches and having a loop-seizing beak rotatable in a vertical circular path in a counter-clockwise direction as viewed from the open face of the loop-taker, said loop-taker being rotatable about a horizontal axis horizontally spaced from the lengthwise extended path of needle reciprocation a distance less than the radius of said loop-taker so that the needle presents the thread-loop to said beak while said beak is traveling from its highest to lowest vertical positions.

4. A sewing machine comprising, a work-support formed with a needle-aperture, an endwise reciprocatory needle-bar disposed at one side of said work-support and confined for rectilinear movements, an eye-pointed needle carried upon said needle-bar for reciprocation through said needle aperture, a rotary loop-taker having a loop-seizing beak and being disposed at the other side of said work-support for rotation about an axis disposed in laterally spaced relation with the lengthwise extended path of needle reciprocation and being disposed at right angles to a plane containing such path, said lateral spacing being less than the radius of said loop-taker, and means for actuating said needle-bar and said loop-taker in timed relation with each other,

said loop-taker being rotated in a direction such that its loop-seizing beak moves during its loopseizing portion of its cycle in a direction away from said work-support.

5. A lock-stitch sewing machine comprising, a work-support provided with a needle aperture, work-feeding mechanism, a reciprocatory needle operating through said needle aperture in a path disposed normal to said work-support, a rotary loop-taker complemental to said needle and having a loop-seizing beak, said loop-taker being mounted for rotation about an axis disposed in laterally spaced relation with the lengthwise extended path of needle reciprocation and being disposed at right angles to a plane containing such path, said lateral spacing being less than the radius of said loop-taker, which latter plane is disposed in parallelism with the direction of work feed, a stationary bobbin-thread carrier associated with said loop-taker and having a bobbinthread delivery means located at a position separated from the axis of loop-taker rotation by a plane disposed in parallelism with such axis and containing the path of needle reciprocation.

6. A sewing machine comprising, a work-support formed with a needle-aperture, an endwise reciprocatory needle-bar disposed at one side of said work-support and confined for rectilinear movements, an eye-pointed needle carried upon said needle-bar for reciprocation through said needle aperture, a rotary loop-taker having a loop-seizing beak and being disposed at the other side of said work-support for rotation about an axis disposed in laterally spaced relation with the lengthwise extended path of needle reciprocation and being disposed at right angles to a plane containing such path, said lateral spacing being less than the radius of said loop-taker, means for actuating said needle-bar and said loop-taker in timed relation with each other, said loop-taker being rotated in a direction such that its loopseizing beak moves during its loop-seizing portion of its cycle in a direction away from said worksupport, and a stationary bobbin-thread carrier associated with said loop-taker and having a bobbin-thread delivery means disposed at that side of said plane remote from said loop-taker and at a position separated from the axis of looptaker rotation by a second plane disposed in parallelism with such axis and containing the path of needle reciprocation.

7. A sewing machine comprising, an endwise reciprocatory needle confined for rectilinear movements, a cup-shaped rotary loop-taker complemental to said needle in the formation of lockstitches and having a loop-seizing beak and a raceway, said loop-taker being mounted for rotation about an axis disposed in laterally spaced relation with the lengthwise extended path of needle reciprocation and being disposed at right angles to a plane containing such path, said lateral spacing being less than the radius of said loop-taker, a substantially cylindrical stationary bobbin-case carrier having a peripheral bearing rib journaled in said raceway, said bearing rib having a circumferential gap therein providing a loop-confining shoulder which is disposed within or slightly beyond, in the direction of rotation of said loop-taker, a plane disposed in parallelism with the axis of loop-taker rotation and containing the path of needle reciprocation, and means for actuating said needle and said looptaker in timed relation.

8. A sewing machine comprising, an endwise reciprocatory needle confined for rectilinear movements, a cup-shaped rotary loop-taker complemental to said needle in the formation of lock stitches and having a loop-seizing beak and a raceway, said loop-taker being mounted for rotation about an axis disposed in laterally spaced relation with the lengthwise extended path of needle reciprocation and being disposed at right angles to a plane containing such path, said lateral spacing being less than the radius of said loop-taker, a substantially cylindrical stationary bobbin-case carrier having a peripheral bearing rib journaled in said raceway, said bearing rib having a circumferential gap therein providing a loop-confining shoulder, which gap is separated from the axis of loop-taker rotation by a plane disposed in parallelism with such axis and containing the path of needle reciprocation, and means for actuating said needle and said looptaker in timed relation.

9. A sewing machine comprising, an endwise reciprocatory needle confined for rectilinear movements, a cup-shaped rotary loop-taker complemental to said needle in the formation of lockstitches and having a loop-seizing beak and a raceway, said loop-taker being mounted for rotation about an axis disposed in laterally spaced relation with the lengthwise extended path of needle reciprocation and being disposed at right angles to a plane containing such path, said lateral spacing being less than the radius of said loop-taker, a substantially cylindrical stationary bobbin-case carrier having a peripheral bearing rib journaled in said raceway, said bearing rib having a circumferential gap therein providing a loop-confining shoulder, which gap is separated from the axis of loop-taker rotation by a plane disposed in parallelism with such axis and containing the path of needle reciprocation, and means for actuating said needle and said looptaker in timed relation with said loop-taker being rotated in a direction such that its loopseizing beak moves during its loop-seizing portion of its cycle through a plane containing said needle path and away from a plane containing said loop-taker axis, which two latter planes are disposed in parallelism with each other.

10. A sewing machine comprising, an endwise reciprocatory needle confined for rectilinear movements, a cup-shaped rotary loop-taker complemental to said needle in the formation of lock stitches and having a loop-seizing beak and a raceway, said loop-taker being mounted for rotation about an axis disposed in laterally spaced relation with the lengthwise extended path of needle reciprocation and being disposed at right angles to a plane containing such path, said lateral spacing being less than the radius of said loop-taker, a substantially cylindrical stationary bobbin-case carrier having a peripheral bearing rib journaled in said raceway, said bearing rib having a circumferential gap therein which is separated from the axis of loop-taker rotation by a plane disposed in parallelism with such axis and containing the path of needle reciprocation, said gap providing a loop-confining shoulder which is spaced from a plane located in parallelism with the path of needle reciprocation and containing the axis of loop-taker rotation substantially 15 degrees measured along an arc generated about said axis, and means for actuating said needle and said loop-taker in timed relation.

11. A sewing machine comprising, an endwise reciprocatory needle confined for rectilinear movements, a cup-shaped rotary loop-taker complemental to said needle in the formation of lockstitches and having a loop-seizing beak and ,a raceway, said loop-taker being mounted for rotation about an axis disposed in laterally spaced relation with the lengthwise extended path of needle reciprocation and being disposed at right angles to a plane containing such path, said lateral spacing being less than the radius of said loop-taker, a substantially cylindrical stationary bobbin-case carrier having a peripheral bearing rib journaled in said raceway, said bearing rib having a circumferential gap therein which is separated from the axis of loop-taker rotation by a plane disposed in parallelism with such axis and containing the path of needle reciprocation, said gap providing a loop-confining shoulder which is spaced from a plane located in parallelism with the path of needl reciprocation and containing the axis of loop-taker rotation substantially 15 degrees measured along an arc generated about said axis, and means for actuating said needle and said loop-taker in timed relation with said loop-taker being rotated in a direction such that its loop-seizing beak moves during its loop-seizing portion of its cycle through a plane containing said needle path and away from a plane containing said loop-taker axis, which two latter planes are disposed in parallelism with each other.

12. A sewing machine comprising, a frame, a work-support carried by said frame and formed with a needle-aperture, a main rotary shaft journaled within said frame at one side of said worksupport, a second rotary shaft journaled within said frame at the other side of said work-support and disposed in parallelism with said first shaft, a third rotary shaft having its longitudinal axis passing through and at right angles to the longitudinal axis of said first shaft and being disposed in laterally spaced relation with the longitudinal axis of said second shaft, a pair of bevel gears connecting said first and third shafts, a pair of hypoid bevel gears connecting said second and third shafts, a rotary loop-taker carried upon one end portion of said second shaft for rotation about the axis of such shaft, and an eye-pointed needle complemental to said looptaker in the formation of lock-stitches and connected with said first shaft for rectilinear reciprocation through said needle-aperture, said needle being mounted with its extended path of movement disposed in parallelism with said third rotary shaft and in laterally spaced relation with the axis of rotation of said loop-taker a distance less than the radius of said loop-taker.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 944,740 Madison Dec. 28, 1909 2,085,699 Kessler June 29, 1937 2,394,511 Clayton Feb. 5, 1946 

